Some hardware seems to be failing.
Long story short. My iMac cramped out Wednesday night. Saw the white screen of death.
Reset PRAM for good measure, reboot to white screen.
Reboot to safe mode, was able to log in to OS X, but as it was loading the doc and the menu bar, white screen of death again.
reboot to recovery, met with white screen with 🚫 in the middle.
reboot to internet recovery and was able to load up recovery from there.
i the. Formatted both my Mac partition and boot camp partition, recombined the partitions and ran first aid with first aid saying everything checked out.
reinstalled OS X and it took 45 minutes to download and about 4 hours to install and get to the initial set up screen.
I then ran a test and installed OS X on a external hard drive and it got to the initial set up screen faster, even though it was connected via usb 2. OS X just didn’t run fast from it after that.
Loading from the Apple logo from my internal drive was still super slow so I did yet another reformat and fresh install. It installed much faster and would load osx faster but not as fast as it did before. And shut downs were slow too.
i did try to boot up the diagnostic program with both holding D and option D but both failed to load.
Then today... got a bunch of stuff downloaded, installed and updated, then had a black screen with a tx_flush message on the top left of the screen. Went away before I could take a picture of it.
rebooted my Mac in Verbose made and it hung on a few parts. (And still hasn’t gotten to to login screen, but now is hanging on the white screen with the Apple logo and the progress bar not moving)
Here are a few pictures of where it was getting hung up at.
iMac 27", macOS 10.15